Light receiver and its identification threshold value generation method
A technology for optical receivers and identification circuits, which is applied in electromagnetic receivers, electromagnetic transceivers, and shaping networks in transmitters/receivers. It can solve problems such as wrong identification levels and achieve the effect of preventing gain conversion
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Embodiment approach 1
[0018] FIG. 1 is a block diagram showing the configuration of an optical receiver according to Embodiment 1 of the present invention. The optical receiver shown in the same figure includes: a light receiving element 1 that receives an optical signal, an output current input to the light receiving element 1, a preamplifier part 2 that converts the input current signal into a voltage signal and outputs it, and an input preamplifier part 2 of the output voltage, identification of the input voltage level of the output voltage of the regeneration section 3. And, as its specific configuration, the buffer section 26 of the preamplifier section 2 includes a transimpedance amplifier 5 (hereinafter referred to as "TIA") and an automatic gain control section 6 (hereinafter referred to as "AGC section"). On the other hand, the composition of the recognition regeneration part 3 includes: an automatic threshold value control part 7 (hereinafter referred to as "ATC part") which generates a p...
Embodiment approach 2
[0034] FIG. 4 is a block diagram showing the configuration of an optical receiver according to Embodiment 2 of the present invention. The identification regeneration part 3 of the optical receiver shown in the same figure has the identification circuit 21 outputting the normal phase output and the reverse phase output on the one hand, replaces the configuration of the identification circuit 18 of Embodiment 1, and further includes: generating the two phases of the identification circuit 21 The comparator circuit 22 as the second comparator circuit for the voltage difference between the outputs, and the sample-and-hold circuit ( Hereinafter referred to as [S / H circuit]) 23 , and an offset adjustment circuit 25 that outputs an offset adjustment signal generated based on the output of the S / H circuit 23 to the ATC section 7 . In addition, in the configuration of the first embodiment, the ATC section 7 is connected to the output side of the average value detection circuit 19, and ...
Embodiment approach 3
[0038] FIG. 5 is a diagram for explaining the operation of the optical receiver according to Embodiment 3 of the present invention. In FIG. 5, the same graph (a) shows a burst signal having an optical signal waveform in which a transient response occurs. The same figure (b) shows each output of the optical receiver, that is, the solid line represents, for example, the normal phase output of the identification circuit 21, and the dotted line represents, for example, the negative phase output of the identification circuit 21. (c) of the same figure shows an example of the control signal waveform of the control signal 24 input to the S / H circuit 23 .
[0039] The characteristic of this embodiment is that in the output method of the control signal 24 shown in FIG. Therefore, the output offset during the no-signal period after power-on is minimized. Furthermore, since the output offset during the no-signal period after power-on is minimized, even in the same no-signal period as t...
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